Malicious PDF — malware analysis report

Static analysis result for SHA-256 df92a244d0640282…

MALICIOUS

PDF

80.1 KB Created: 2021-02-16 00:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5e4f032c40b28ccfa666698ec70fd4a2 SHA-1: e9396521e072f05cb1765dab06cdb5cff2a97477 SHA-256: df92a244d06402828a8b63685b545d23ec568ca944c6f6cdee18e12e934e359c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=how+do+you+make+beef+jerky+without+a+dehydrator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425501/normal_5fd1bc080c727.pdfIn PDF document text
    • http://top-odejda.com/balupu_telugu_movie_hd_video_songstwd4h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412775/normal_600350853be83.pdfIn PDF document text
    • http://unityfree.xyz/create_alert_box_in_androidpsda1.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/b03iieZ/59426337596.pdfIn PDF document text
    • http://fitit.space/ejercicios_numero_atomico_y_masico_2_esop7rpm.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/kXgiYgf/gamewoxogi.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/ifdZr6p/starmaker_sing_free_karaoke_songs.pdfIn PDF document text
    • http://stalekost.site/star_wars_rogue_one_mp48d5zo.pdfIn PDF document text
    • https://gegadibiliwo.weebly.com/uploads/1/3/1/8/131871883/foraxizaguxuwow-pitomanew-zoxizowamu-pexadugeja.pdfIn PDF document text
    • http://hookup154.site/984638955180rots.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/tMHijge/fafizotatuzitijuxuxisep.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxobenona/3ieibib/fruit_clinic_master_21_de_mayo_penaflor_penaflor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490735/normal_60270cc296505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_6014021edfe33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/gta_5_police_uniform_cheat_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/answer__bgm.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/97812772465.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 3532 bytes
SHA-256: aa26cb8ac343807d11dd1466a6269689368e3e4c074a31496514b933972f17e9
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 5372 bytes
SHA-256: af67cdf1c38ee7ca3932425d565935f677e9750fd5c0c257955c8545988b2af6
font_02_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 11072 bytes
SHA-256: f26e4abf01d254aef8052d2e5198a33525e75ac789a802d200f8d267b9d6eb58

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